OWINO , Charles O.; NTHIGA , E.W.; MUTHAKIA, Gerald K.; ONYANCHA, Douglas. Removal of Cr3+ From Tannery Wastewater Using Unmodified And Acid-Modified Arabica Coffee Husk Adsorbent. International Journal of Scientific Research in Chemical Sciences, [S. l.], v. 8, n. 5, p. 4–9, 2021. Disponível em: https://ijsrcs.isroset.org/index.php/j/article/view/102. Acesso em: 5 apr. 2025.